The Universe. Our Solar System. Mars.

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Mars is the fourth planet from the Sun in the Solar System.
Marsorbitsolarsystem.gifMars is often described as the "Red Planet" as the iron oxide prevalent on its surface gives it a reddish appereance. Mars is a terrestrial planet with a thin atmosphere, having surface features reminiscent both of the impact craters of the Moon and the volcanoes, valleys, deserts, and porlar ice caps of Earth. Mars has two moons. Mars’ average distance from the Sun is roughly 230 million km and its orbital period is 687 days. Mars can be observed from Earth, but the latest detailed information comes from four active probes on or in orbit around Mars as of 2012: Mars Odyssey, Mars Express, Mars Reconnaissance Oribter, and Opportunity rover.